fix: bg border return before getCell

[lumixraku]

close #xxx

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

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Playwright test results

 8 passed

Details

 8 tests across 3 suites
 2 minutes, 12 seconds
 80411e0
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[codecov]

Codecov Report

Attention: Patch coverage is 51.16279% with 21 lines in your changes missing coverage. Please review.

Project coverage is 31.81%. Comparing base (1964a4c) to head (80411e0).
Report is 10 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ine-render/src/components/sheets/sheet-skeleton.ts	0.00%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3623      +/-   ##
==========================================
- Coverage   31.87%   31.81%   -0.06%     
==========================================
  Files        2193     2194       +1     
  Lines      115294   115517     +223     
  Branches    25402    25435      +33     
==========================================
+ Hits        36745    36747       +2     
- Misses      78549    78770     +221     

Flag	Coverage Δ
	31.81% <51.16%> (-0.06%)	⬇️

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